A 4π recoil-ion electron momentum analyzer: a high-resolution “microscope” for the investigation of the dynamics of atomic, molecular and nuclear reactions

Moshammer, R.; Unverzagt, M.; Schmitt, W.; Ullrich, J.; Schmidt‐Böcking, H.

doi:10.1016/0168-583x(95)01259-1

Cited by 206 publications

(93 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At these points in electron phase space the error diverges. They are a very small fraction of the total final-state phase space and are excluded in our analysis (see [39] for a more detailed discussion of this type of electron imaging spectrometer). For the recoil-ion momentum measurement our spectrometer has a fixed absolute momentum uncertainty in all three dimensions which is 0.14 au FWHM in the direction of the electric field and about 0.29 au FWHM in the direction of the gas jet and the photon beam.…”

Section: Methodsmentioning

confidence: 99%

“…A set of Helmholtz coils (1.2 m diameter) generated a magnetic field of 11 G, parallel to the electric field. The combined electric and magnetic field guided the electrons onto a second position-sensitive detector (see [39] for a detailed description of the electron spectrometer). The fields yield 4π solid angle for electrons up to 22 eV energy.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Photo double ionization of He by circular and linear polarized single-photon absorption

Achler

Mergel

Spielberger

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We have measured absolute fully differential cross sections for photo double ionization of helium by circularly and linearly polarized light 20 eV above threshold. The data have been obtained by measuring in coincidence the momentum vector of the He 2+ ion and one of the electrons, covering 4π solid angle for all particles. We give an overview over the momentum distribution in the three-body continuum and show fivefold differential cross sections. We find a swirl in the electron momentum space for double ionization by circularly polarized light. The present data supersede earlier data from our group (V mergel et al 1998 Phys. Rev. Lett. 80 5301).M This article features multimedia enhancements available from the abstract page in the online journal; see www.iop.org.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Photo double ionization of He by circular and linear polarized single-photon absorption

Achler

Mergel

Spielberger

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

“…One possible solution would be to use the similar time-of-flight technique as for the recoil ions, but with adding magnetic field parallel to the extraction electric field, thus allowing to collect electrons from a wider polar angle. In existing applications such a method was used for electrons with energies of only 0.1 keV [51,52]. In [53] retarding field was added in the electron drift region allowing to work with electrons of up to 0.5 keV energies.…”

Section: Coltrims and β -Decaysmentioning

confidence: 99%

Searching for dark matter sterile neutrinos in the laboratory

Bezrukov

Shaposhnikov

2007

Phys. Rev. D

View full text Add to dashboard Cite

If the dark matter of the Universe is made of sterile neutrinos with the mass in keV region they can be searched for with the help of X-ray satellites. We discuss the prospects of laboratory experiments that can be competitive and complimentary to Space missions. We argue that the detailed study of β decays of tritium and other nuclei with the help of Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) can potentially enter into interesting parameter range and even supersede the current astronomical bounds on the properties of dark matter sterile neutrino.

show abstract

“…Since a detailed description of the working principle of the reaction microscope has been reported earlier [21], we give here only a brief outline stressing the particularities of the present set-up. A scheme of the apparatus is presented in figure 1.…”

Section: Methodsmentioning

confidence: 99%

Reply to “Comment on ‘Appearance and disappearance of the second Born effects in the(e,3e)reaction on He’ ”

et al. 2005

Self Cite

View full text Add to dashboard Cite

Abstract:The dynamics of helium double ionization by 2 keV electron impact has been investigated experimentally and theoretically at large momentum transfer of |q| = 2 a.u. Fully resolved fivefold differential cross sections (FDCS) are presented for symmetric and asymmetric energy sharing between the two ejected electrons at excess energies from 10 eV to 40 eV, and for the coplanar as well as the out-of-plane scattering geometries. Experimentally, a multielectron -recoil-ion coincidence technique has been applied and a large part of the final-state momentum-space has been mapped. The presently employed theoretical model treats the interaction between the two slow ejected electrons nonperturbatively using the convergent close coupling (CCC) method, whereas the projectile-target interaction is described in the first Born approximation. The experimental and theoretical FDCS agree well in shape. The cross section is dominated by two pairs of strong peaks. From this pattern it can be concluded that the two-step 1 mechanism which is due to interelectron interaction after a single ionizing collision is the dominant ionisation process for the present kinematics.2

show abstract

A 4π recoil-ion electron momentum analyzer: a high-resolution “microscope” for the investigation of the dynamics of atomic, molecular and nuclear reactions

Cited by 206 publications

References 42 publications

Photo double ionization of He by circular and linear polarized single-photon absorption

Photo double ionization of He by circular and linear polarized single-photon absorption

Searching for dark matter sterile neutrinos in the laboratory

Reply to “Comment on ‘Appearance and disappearance of the second Born effects in the(e,3e)reaction on He’ ”

Contact Info

Product

Resources

About